Multilayered mullite/Mo cermet functionally gradient material (FGM) was fabricated through
a powder stacking process and sintering in vacuum up to 1500°C. The composition distribution, microstructure
and microhardness of the FGM were analyzed. The results indicated that the mullite/Mo FGM
was well densified with composite graded distribution and there was no new phase appeared. The microhardness
of the FGM increase from 467HV to 1543HV, the density from 2.919 to 7.106 g/cm3 as the
content of mullite increase from 20% to 80%. The relative density exceeded 90% as the content of mullite
reached 80%. Thermal shock test showed that the cracks passed through the joint without deflection.